# 1.4 Measures of Dispersion for Sample Data Flashcards

1
Q

What does sample variance use as a point of reference?

A

The sample mean

2
Q

By definition, the sample variance is ______________.

A

non-negative

3
Q

What is the unit of sample variance?

A

Expressed in squared units

4
Q

What is the unit of the standard deviation?

A

Expressed in the same unit as the sample mean and the random variable

5
Q

What does the coefficient of variation allow?

A

To compare samples of data collected for two random variables expressed in different units or samples of data with very different means

6
Q

What is the unit of the coefficient of variation?

A

Unitless

7
Q

Which measure of dispersion is expressed in squared units?

A

Sample variance

8
Q

Which measure of dispersion is expressed in the same unit as the random variable?

A

Standard deviation

9
Q

Which measure of dispersion is unitless?

A

Coefficient of variation

10
Q

What is the equation for sample variance?

A
11
Q

What is the equation for standard deviation?

A
12
Q

What is the equation for the coefficient of variation?

A